topic S32K312EVB-Q172 HardFault_Handler occurs before debugging starts in S32K

S32K312EVB-Q172 HardFault_Handler occurs before debugging starts

Sara_X — Tue, 26 Dec 2023 10:56:25 GMT

Burn the Debug code with PE, click the debug button, and the code is the starting stop position as shown in the figure. This version of the demo code has been successfully run, and hit the breakpoint debugging. The code has not changed. Re-burn the code to debug. Before debugging begins, there is b.n 0x407940 <HardFault_Handler> as shown in the figure.Who knows what the error is and how to fix it?

Looking forward to answering. Thank you!

Re: S32K312EVB-Q172 HardFault_Handler occurs before debugging starts

danielmartynek — Fri, 29 Dec 2023 14:48:35 GMT

Hi @Sara_X,

Can you disable the Run on reset option and step through the code from the reset vector?

Which instruction is causing the fault?

Regards,

Daniel

Re: S32K312EVB-Q172 HardFault_Handler occurs before debugging starts

Sara_X — Wed, 24 Jan 2024 03:12:39 GMT

Hi.@danielmartynek

I disable the Run on reset option and step through the code from the reset vector.Also, I discovered that the code doesn't always enter the "hard fualt" function -- "HardFault_Handler()". Some days, the "hard fualt" is entered when executing the command "_INIT_DATA_BSS:bl init_data_bss" to erase the ".bss Section". On some days it is possible to enter "hard fualt" when executing "__SYSTEM_INIT:bl SystemInit", and on some days it is possible to execute:
"_MAIN:
cpsie i
bl startup_go_to_user_mode
bl main "and do not enter" hard fualt ".

The following two diagrams show where to enter the "hard fualt" function - "HardFault_Handler()" after entering the init_data_bss function and the SystemInit function.I haven't figured out why all three of these things happen.Can you help with the analysis?

Re: S32K312EVB-Q172 HardFault_Handler occurs before debugging starts

Sara_X — Wed, 24 Jan 2024 03:29:20 GMT

Hi.@danielmartynek

After I replied to your email, I reset the software again, and it can run to line 629 again and then smoothly enter the main function without entering the hard fault function.

Re: S32K312EVB-Q172 HardFault_Handler occurs before debugging starts

danielmartynek — Wed, 24 Jan 2024 12:36:44 GMT

Hi @Sara_X,

What kind of fault exception is it?

Can you read the Fault Status Register (CSFR)?

BR, Daniel